Iwatsu SC7101 - ADJUSTMENT of REFERENCE OSCILLATOR Sesseeeseeccccccccenccccecccencesssceassssssesessees; Preparation for Adjustment; Removing the Upper Cover; External Reference Oscillator

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SC-7101/SC-7102

Section

4

Adjustment

of

Reference

Oscillator

Though

the

SC-7101

and

the

SC-7102

counters

use

a

high

accuracy

crystal

oscillator,

when

continuous

measurement

of

high

accuracy

are re-

quired,

adjust

the

crystal

oscillator.

4-1

PREPARATION

FOR

ADJUSTMENT

Perform

adjustment

of

the

reference

oscillator

by

removing

the

upper

case.

4-1-1

Removing

the

Upper

Cover

Remove

the

upper

cover

by

the

following

pro-

cedures.

1.

Face

the

instrument

bottom

up

and

remove

3

screws

on

the

bottom.

(See

to

Figure

4-1-

1).

Hold

the

bottom

and

upper

covers

between

both

hands

securely

and

place

with

the

bottom

down.

Lift

the

upper

cover

rear

end

slightly

up

and

remove

the

upper

case

by

pulling

it

back-

ward.

(The

upper

cover

front

end

is

inserted

into

the

panel

frame).

(See

Figure

4-1-2).

2

3

Figure

4-1-1.

Screw

Location

on

Bottom

|

|

&

HAT

TMT

TE

HEH

HEH

f

o

6

&

o

2.

a

o

1g

WHT

<Note>

To

install

the

upper

cover,

reverse

the

above

procedures

to

remove

the

upper

cover.

4-1-2

External

Reference

Oscillator

Accuracy

of

the

reference

oscillator

is

as

follows:

Sc-7101

10

MHz

reference

signal

of

+1

x

10°’.

SC-7102

10

MHz

reference

signal

of

+1

x

1078.

Figure

4-1-2.

Removing

the

Upper

Cover

oF

ae

=

Right

side!

@